Aldebaran and Centauri File Mineral Resource Update on the Rio Grande Gold-Copper Project on SEDAR+

• Event: Filing of updated NI 43-101 Technical Report and Mineral Resource Estimate (MRE) for the Rio Grande Gold-Copper Project on SEDAR+.
• Date: April 16, 2026.
• Parties: Aldebaran Resources Inc. and Centauri Minerals Inc.
• Location: Salta Province, Argentina.
• Qualified Person: Mr. Benjamin Sanfurgo FAusIMM, ChMC (SLR Consulting).
• Context: This filing formalizes the resource update previously announced on March 2, 2026 ("Significant Increase in Mineral Resources"). It pertains to the Rio Grande project which is being spun out into Centauri Minerals.
• Key Details: The report confirms compliance with National Instrument 43-101 standards and provides the technical basis for the spin-out transaction where Aldebaran shareholders receive up to 78% of Centauri equity.

• Incremental Value: Low. The core resource data was disclosed in the March 2, 2026 announcement; this filing is a regulatory formality confirming that data. It does not introduce new grades or tonnage beyond what was already priced into the market.
• Market Reaction Context: Despite strong PEA economics ($2B NPV) and recent financing ($45M raised), the stock has declined from a high of $4.18 (Jan 2026) to current levels (~$2.85). The market appears to be discounting dilution risks or jurisdictional concerns rather than reacting positively to resource updates.
• Spin-out Validation: This filing is critical for Centauri's path to a public listing in H1 2026, which validates the corporate structure intended to unlock value for Aldebaran shareholders via share distribution.
• Dilution Overhang: The company raised $45M CAD in February at $3.25/share. Current trading price ($2.85) is below this offering price, indicating significant selling pressure or lack of confidence that the capital raise will immediately translate to equity value appreciation.

• Company: Aldebaran Resources Inc. (TSX.V: ALDE, OTCQX: ADBRF).
• Flagship Project: Altar Copper-Gold Project, San Juan Province, Argentina.
• Project Status: Development stage; Preliminary Economic Assessment (PEA) completed with $2B NPV. Moving toward Pre-Feasibility Study (PFS).
• Secondary Asset: Rio Grande Gold-Copper Project (Salta), being spun out into Centauri Minerals Inc.
• Management: John Black (CEO), Kevin B. Heather (Chief Geological Officer).
• Strategy: Advance Altar to production while monetizing the northern Argentina portfolio via Centauri spin-out and IPO.